Home / 19,556.80-29,342.40-7,871.20

Finding the Fourth Proportional to 19,556.80, 29,342.40 and 7,871.20

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Solution

The fourth proportional to 19,556.80, 29,342.40 and 7,871.20 is: 11,809.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,556.80 : 29,342.40 = 7,871.20 : x
  2. Step 2: Convert to fraction form
    19,556.80/29,342.40 = 7,871.20/x
  3. Step 3: Cross multiply
    19,556.80x = 29,342.40 × 7,871.20
  4. Step 4: Simplify right side
    19,556.80x = 230,959,898.88
  5. Step 5: Solve for x
    x = 230,959,898.88/19,556.80
  6. Step 6: Final answer
    x = 11,809.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.